1 files changed, 99 insertions, 0 deletions
diff --git a/absl/base/internal/scoped_set_env_test.cc b/absl/base/internal/scoped_set_env_test.cc
new file mode 100644
index 000000000000..4bd68c48b944
--- /dev/null
+++ b/absl/base/internal/scoped_set_env_test.cc
@@ -0,0 +1,99 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include "gtest/gtest.h"
+#include "absl/base/internal/scoped_set_env.h"
+
+namespace {
+
+using absl::base_internal::ScopedSetEnv;
+
+std::string GetEnvVar(const char* name) {
+#ifdef _WIN32
+  char buf[1024];
+  auto get_res = GetEnvironmentVariable(name, buf, sizeof(buf));
+  if (get_res == sizeof(buf)) {
+    return "TOO_BIG";
+  }
+
+  if (get_res == 0) {
+    return "UNSET";
+  }
+
+  return std::string(buf, get_res);
+#else
+  const char* val = ::getenv(name);
+  if (val == nullptr) {
+    return "UNSET";
+  }
+
+  return val;
+#endif
+}
+
+TEST(ScopedSetEnvTest, SetNonExistingVarToString) {
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+
+  {
+    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
+
+    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+  }
+
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+}
+
+TEST(ScopedSetEnvTest, SetNonExistingVarToNull) {
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+
+  {
+    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
+
+    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+  }
+
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+}
+
+TEST(ScopedSetEnvTest, SetExistingVarToString) {
+  ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+
+  {
+    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "new_value");
+
+    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "new_value");
+  }
+
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+}
+
+TEST(ScopedSetEnvTest, SetExistingVarToNull) {
+  ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", "value");
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+
+  {
+    ScopedSetEnv scoped_set("SCOPED_SET_ENV_TEST_VAR", nullptr);
+
+    EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "UNSET");
+  }
+
+  EXPECT_EQ(GetEnvVar("SCOPED_SET_ENV_TEST_VAR"), "value");
+}
+
+}  // namespace